Composition for roof-coating



UNITED STATES PATENT OFFICE.

WILLIAM S. SMITH, OF LOCK HAVEN, PENNSYLVANIA.

COMPOSITION FOR ROOF-COATING.

SPECIFICATION forming part of Letters Patent No. 452,086, dated May 12, 1891.

Application filed September 1, 1890- To all whom it may concern.-

Be it known that I, WILLIAM S. SMITH, of Lock Haven, in the county of Clinton, in the State of Pennsylvania, have invented new and useful Improvements in Compounds for Root Coatings, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to a compound for treating shingle, tin, or iron roofs.

My object is to produce a composition of ingredients which when mixed and commingled together and applied to a shingle, tin, or iron roof will expand and contract with the shingles or iron, and thus not crack or flake off, as is common with most roof-coatings, and also to provide a coating for roofs with great body, and thus afford permanent protection to such roofs from the elements.

My invention consists in mixing and commingling the several ingredients hereinafter described, and set forth in the claims hereto annexed. I take about twenty per cent. each of gas tar, gum-asphaltum, and rosin, which are heated thoroughly and mixed together,

which I call the base, and to this base I add about twenty per cent. pulverized slate and fifteen per cent. Venetian red. To this compound I add Inuriatic acid in suflicient Serial no. 363,709. (No specimens.)

quantities to make the compound into a liquid, so that it may readily be appliedwith a brush.

I have found by making repeated experiments that the addition of Venetian red serves not only to give the compound color, but, unitingwith the various ingredients thereof, makes the same elastic, so that it may expand and contract with the heat and cold without cracking. I also find that by the addition of muriatic acid the inflammability of the tar and slate, Venetian red, and muriatic acid in sufficient quantities to make a compound liquid. In witness whereof I have hereunto set my hand this 22d day of August, 1890.

IVILLIAM S. SMITH. In presence of- J W. FLEMING, JAMES A. WENSEL. 

